at89c51rc-33pc ATMEL Corporation, at89c51rc-33pc Datasheet - Page 9

• Manufacturer Part Number: at89c51rc-33pc
• Description: 8-bit Microcontroller With 32k Bytes Flash
• Manufacturer: ATMEL Corporation

Table 5-3.
Table 5-4.
1920C–MICRO–03/05
AUXR
–
DISALE
EXTRAM
DISRTO
WDIDLE
AUXR1
–
DPS
Reserved for future expansion
DISALE
0
1
EXTRAM
0
1
DISRTO
0
1
Disable/Enable WDT in IDLE mode
WDIDLE
0
1
Reserved for future expansion
Data Pointer Register Select
DPS
0
1
Disable/Enable ALE
Internal/External RAM access using MOVX @ Ri/@DPTR
Disable/Enable Reset out
AUXR1: Auxiliary Register 1
AUXR: Auxiliary Register
Address = 8EH
Not Bit Addressable
Address = A2H
Not Bit Addressable
Bit
Bit
Operating Mode
ALE is emitted at a constant rate of 1/6 the oscillator frequency
ALE is active only during a MOVX or MOVC instruction
Operating Mode
Internal ERAM (00H-FFH) access using MOVX @ Ri/@DPTR
External data memory access
Operating Mode
Reset pin is driven High after WDT times out
Reset pin is input only
Operating Mode
WDT continues to count in IDLE mode
WDT halts counting in IDLE mode
Selects DPTR Registers DP0L, DP0H
Selects DPTR Registers DP1L, DP1H
–
7
–
7
–
6
–
6
–
5
–
5
WDIDLE
4
–
4
DISRTO
3
–
3
–
2
–
2
Reset Value = XXXXXXX0B
Reset Value = XXX00X00B
EXTRAM
1
–
1
AT89C51RC
DISALE
DPS
0
0
9